VAR-202006-1851

Vulnerability from variot - Updated: 2024-11-23 19:29

An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function. LibVNCServer There is an information leakage vulnerability in.Information may be obtained. Pillow is a Python-based image processing library. There is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

====================================================================
Red Hat Security Advisory

Synopsis: Moderate: libvncserver security update Advisory ID: RHSA-2021:1811-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:1811 Issue date: 2021-05-18 CVE Names: CVE-2018-21247 CVE-2019-20839 CVE-2020-14397 CVE-2020-14405 CVE-2020-25708 ==================================================================== 1. Summary:

An update for libvncserver is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

  1. Relevant releases/architectures:

Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

  1. Description:

LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.

Security Fix(es):

  • libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)

  • libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)

  • libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)

  • libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)

  • libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.

  1. Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

  1. Bugs fixed (https://bugzilla.redhat.com/):

1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock() 1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak 1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size 1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference 1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS

  1. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source: libvncserver-0.9.11-17.el8.src.rpm

aarch64: libvncserver-0.9.11-17.el8.aarch64.rpm libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm

ppc64le: libvncserver-0.9.11-17.el8.ppc64le.rpm libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm

s390x: libvncserver-0.9.11-17.el8.s390x.rpm libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm

x86_64: libvncserver-0.9.11-17.el8.i686.rpm libvncserver-0.9.11-17.el8.x86_64.rpm libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm

Red Hat CodeReady Linux Builder (v. 8):

aarch64: libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm libvncserver-devel-0.9.11-17.el8.aarch64.rpm

ppc64le: libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm libvncserver-devel-0.9.11-17.el8.ppc64le.rpm

s390x: libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm libvncserver-devel-0.9.11-17.el8.s390x.rpm

x86_64: libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm libvncserver-devel-0.9.11-17.el8.i686.rpm libvncserver-devel-0.9.11-17.el8.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/

  1. References:

https://access.redhat.com/security/cve/CVE-2018-21247 https://access.redhat.com/security/cve/CVE-2019-20839 https://access.redhat.com/security/cve/CVE-2020-14397 https://access.redhat.com/security/cve/CVE-2020-14405 https://access.redhat.com/security/cve/CVE-2020-25708 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/

  1. Contact:

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1

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-- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce

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    "data": "An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function. LibVNCServer There is an information leakage vulnerability in.Information may be obtained. Pillow is a Python-based image processing library. \nThere is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n====================================================================                   \nRed Hat Security Advisory\n\nSynopsis:          Moderate: libvncserver security update\nAdvisory ID:       RHSA-2021:1811-01\nProduct:           Red Hat Enterprise Linux\nAdvisory URL:      https://access.redhat.com/errata/RHSA-2021:1811\nIssue date:        2021-05-18\nCVE Names:         CVE-2018-21247 CVE-2019-20839 CVE-2020-14397\n                   CVE-2020-14405 CVE-2020-25708\n====================================================================\n1. Summary:\n\nAn update for libvncserver is now available for Red Hat Enterprise Linux 8. \n\nRed Hat Product Security has rated this update as having a security impact\nof Moderate. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available for each vulnerability from\nthe CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64\n\n3. Description:\n\nLibVNCServer is a C library that enables you to implement VNC server\nfunctionality into own programs. \n\nSecurity Fix(es):\n\n* libvncserver: uninitialized memory contents are vulnerable to Information\nLeak (CVE-2018-21247)\n\n* libvncserver: buffer overflow in ConnectClientToUnixSock()\n(CVE-2019-20839)\n\n* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n(CVE-2020-14397)\n\n* libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n(CVE-2020-14405)\n\n* libvncserver: libvncserver/rfbserver.c has a divide by zero which could\nresult in DoS (CVE-2020-25708)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat\nEnterprise Linux 8.4 Release Notes linked from the References section. \n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock()\n1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak\n1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS\n\n6. Package List:\n\nRed Hat Enterprise Linux AppStream (v. 8):\n\nSource:\nlibvncserver-0.9.11-17.el8.src.rpm\n\naarch64:\nlibvncserver-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-0.9.11-17.el8.s390x.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-0.9.11-17.el8.i686.rpm\nlibvncserver-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\n\nRed Hat CodeReady Linux Builder (v. 8):\n\naarch64:\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\nlibvncserver-devel-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-devel-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\nlibvncserver-devel-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\nlibvncserver-devel-0.9.11-17.el8.i686.rpm\nlibvncserver-devel-0.9.11-17.el8.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security.  Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2018-21247\nhttps://access.redhat.com/security/cve/CVE-2019-20839\nhttps://access.redhat.com/security/cve/CVE-2020-14397\nhttps://access.redhat.com/security/cve/CVE-2020-14405\nhttps://access.redhat.com/security/cve/CVE-2020-25708\nhttps://access.redhat.com/security/updates/classification/#moderate\nhttps://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. 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Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.